Jig for mortising doors and jambs



Nov. 17, 1953 C. C. JARRETT ET AL JIG FOR MORTISING DOORS AND JAMES ZSheetS-Sheet 1 Filed April 18, 1952 a v #w R W mms r/f Mad IAM #5 M ,4TTUR/WE) the same.

Patented Nov. 17, 1953 OFFICE 2,659,159 JIG FOR MORTISING DOORS ANDJAMES Chester 0. Jarrett and Morris N. Griswold, Enumclaw, Wash.

Application April 18, 1952, Serial No. 283,144

This invention relates to jigs for locating the positions of mortiseswith the lengths, widths and depths thereof, and for guiding tools forcutting the mortises, for doors and door jambs.

In the practice of mounting hinge butts to doors and jambs it isimportant to provide mortises which will enable the butts to fit snuglywithin the same and have solid and even surfaces in the bases of themortises for supporting the doors, it is also important to providemortises for disposition of lock plates for doors to fit therein snuglyand uniformly.

'It is therefore an object of this invention to provide an adjustablejig or device for locating and limiting the dimensions of the mortisesand for guiding and. supporting tools for cutting A further object is toprovide a device which may be" economically constructed, for adjustableconnection to edges of doors and door jambs for locating and limitingthe dimensions of mortises and for guiding tools for cutting themortises, and a particular object is to provide such a jig or device,having a frame and clamp for adjustable connection over the edges ofdoors and jambs, with a movable plate on top of the frame for limitingthe inner side of the mortise, and an adjustable flange for limiting thelengths of the mortises, with an adjustable plate for limiting the outeredge of the mortises, together with means for determining the depths ofthe mortises, such limiting means for the dual purpose of guiding andsupporting tools for cutting the mortises.

With these and other objects to be hereinafter stated, we haveillustratively exemplified our invention by the accompanying drawings,of which:

Figure 1 is a perspective view of the assembled device. I

Figure 2 is a fragmentary view of a, portion of the edge of a door withan enclosed mortise therein for a lock plate.

Figure 3 is a fragmentary view of a portion of a door jamb with amortise across one side of the face thereof for a hinge butt.

Figure 4 is a section view of the device clamped over the edge of adoor, taken on line 4-4 of Fig. 1.

Figure 5 is a section view of the device clamped across a door jamb,taken on the same line 4-4 of Fig. 1.

Figure 6 is a perspective view of a portion of a bracket for supportingtools, for cutting the base of a mortise, and for supporting a faceplate, for determining the outer edge of a mortise,

2 Claims. (01. 33-197) 2 Figure 7 is a section View of fragments of theframe and top plate thereon with a stud bolt for binding the partstogether.

' Figure 8 is a front view of the binding jaw and notch along the topmargin thereof for determining the depth of a mortise for hinge buttswith studs for binding the bracket thereon.

Like characters on the different figures represent like parts. Theletter A indicates a fragment of the edge of a door, and the letter Bindicates the edge of a door jamb. The letter C indicates generally arelatively flat frame for adjustable connection over the edges of doorsand jambs. Numeral it represents a down turned end of the frame for ajaw for binding against the outer side of the doors and jambs, andnumeral Ii represents a clamp screw with a handle 12 on the inner endand a revolvable head it for bindme against the inner sides of doors andjambs for retaining the device in desired positions along the edges.Numeral [3 indicates an offset in the frame for providing clearance overthe usual stop IE on the jambs.

mensions for laying out mortises of largest dimensions.

The letter D indicates a top plate slidably disposed over the frame andguided thereon over threaded studs 57 extended from the frame throughslots in the plate, with wing nuts for binding the plate in desiredpositions. 'The outer end of the plate is down turned to provide ashoulder l6 adjacent to the inner side of the area and adapted to limitthe inner side of-the area and provide a guide and support for downcutting tools such as chisels 3B for cutting the inner edges of themortises, at such positions as the shoulder may be located by slidingthe plate.

The letter E represents a strap member which is mounted upon said plateover the said shoulder on studs i8 projected from the plate throughslots in the strap. The strap is slidabie longitudinally and may beretained in any desired position by nuts on the studs. A flange it isextended forwardly from a lower portion of the strap across and adjacentto the area for deter mining one endof the mortises andfor guiding andsupporting cutting tools. The opposite end of the mortises beingdetermined by the other end of the wall of the area, which also mayguide and support down cutting tools.

order to provide limiting guides for the outer edges of the mortises anddepths thereof, the outer jaw Ii) is provided with a notch 20 along thetop thereof of length and depth equal Inside of and'adjacent to the jawis provided an open area [5 of suitable dito greatest lengths and depthsof mortises to be out. A bracket F is slidable vertically and supportedon studs 2| extended outward from the jaw through slots 23 in thevertical leg 22 of the bracket, and may be held in predeterminedelevation by binding nuts on the last described studs. In order todetermine the outer line of limit of it closed mortise such as showninliig. 2 for a door look, a face plate G is mounted for slidabledisposition on the top of the arm 24 and the arm elevated to bring theface plate level with the margin of the door and then moved inward overthe same to location desired Torthe outer 4 in desired positions on thedoors and jambs, a top plate slidable laterally over the frame having adown turned shoulder adjacent to the inner edge of the area fordetermining the inner line of the mortises and for supporting andguiding tools for cuttmg along the line, a strap member slidably mountedover and across the outer end or the top plate having a flange extendedforwardly across the area he determining one end of the mortise atvarying positions and "for guiding and supporting tools for cutting sideof the mortise, and may be then secured to, V

the arm by any suitable bolts indicated as '25 through slots 26 and 28with wing nuts 21, to provide a guide and support for a tool for cuttingthe outer side of the mortise.

In order to determine the depth of the mortise Ior hinge butts asseen inFig; 3, the face plate is disposed evenly with the inner face of the jawand the bracket and face plate disposed at such elevation along thenotch to conform with the thickness of the butts to be mounted, andthereuponasuitable cutting chisel may be operated horizontally andsupported evenly across the face plate for providing a smooth seat forthe hinge butts. In such last described operation it is preferable toconnect the face plate to the arm by bolts extended downward with topheads even with the top of the face plate, to prevent obstructions tothe tools. In cases where the face plate is -not required iordeterminingthe outer edges of the mortises, it is generally preferable to removethe plate from the arm, and raise and fix the arm at the elevationacross the notch to provide the support for the cross cutting tool, andin order to provide a depression deeper than the mortise iorreceiving alock bo1t, a circular opening indicated as 29 may be provided throughthe face plate for guiding a boring instrument.

-Having described our invention, we claim as new for LettersPatent: V V

1. A device for locating mortises for hinge -butts and locks on doorsand door jambs and for supporting and guiding tools for cutting themortises, comprising, a frame for adjustable connection upon edges ofdoors and j an bs-having an open area adjacent to theouter end oftheirame for locating the mortises-,;a down turned jaw for dispositionagainst the outer side of the doors {and jambs and an adjustable clampfor binding ainst the inner sides for sustaining the device downward forthe end of the mortise, a fixed wall at the opposite end of the area fordetermining such opposite end and for guiding and upporting a cuttingtool, a notch provided along the top of the jaw of greatest depth forthickness exceeding the thickness of butts, a bracket disposed on theouter face of the jaw in vertical slidable relation for limiting thedepth of the mortises, a iaceplate slidably disposed on top of thebracket for determining the outer edges of morti'se's for locks, and forguiding and 'siipp61tirig tools for havin a downtuined shoulder forlimiting the inner edges of the mortises and for supporting and guidingtools f'or cutting the same, a. strap member slidably cisposecacross theouter end of the top plate above the shoulder having a 'fi'ang'eextended forwardly across the aperture for determining one end of themortises for limiting the lengths thereof and for a guide and supportfor cutting tools CHESTER TC.

MORRTS -N. .GRISW'OTI).

References Cited in the file of this patent I TNITED STATES PATENTSNumber Name Date 990,452 Monetteet a1. r Apr. 25, 1911 1,017g81l ScelzaFeb. 20, 1912 1,679,074 Carter l July 31, 1928 2,427,081 Zern Sept. 9,1947

